IBM Support

IV30061: INTERMITTENT INSTABILITY (CRASHES, ASSERTIONS, OR INCORRECT BEHA VIOUR) WHILE USING AOT COMPILED CODE.

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    

Local fix

  • To avoid the problem, you can specify the -Xnoaot command-line
    option to prevent the use of AOT code, but this workaround may
    have a negative effect on application performance.
    

Problem summary

  • When using WebSphere Real Time for Real Time Linux and Ahead Of
    Time (AOT) compiled code, the AOT compiled code did not always
    describe the complete meta-data to help the garbage collector
    (GC) decide what objects are live at the program points in the
    compiled code.  If a GC cycle stopped a thread at just the wrong
    place, a live object could be missed by the garbage collector
    causing incorrect behaviour (perhaps even a crash or a JVM
    assertion) later on in application execution.
    

Problem conclusion

  • This defect will be fixed in:
    WRT-V3 SR3
    .
    The Ahead Of Time code compiler has been updated to correctly
    record all the meta-data required by the garbage collector so
    that live objects will not be lost.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV30061

  • Reported component name

    WRT JIT

  • Reported component ID

    5724R0402

  • Reported release

    300

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-10-12

  • Closed date

    2012-10-12

  • Last modified date

    2012-11-11

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    WRT JIT

  • Fixed component ID

    5724R0402

Applicable component levels

  • R300 PSY

       UP

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Document Information

Modified date:
11 November 2012